Flame cultivation of plants



Feb. 13, 1945.

P. C. M LEMORE FLAME CULTIVATION OF PLANTS Filed May 8, 1942 4Sheets-Sheet 1 INVENTOR. ljrice chrerzlea ghmcl enzore,

Feb. 13, 1945. I v Q MCLEMORE 2,369,154

7 FLAME CULTIVATION 0F PLANTS Filed May 8, 1942 4 heets-Sheet 2 J 8INVENTOR. 5f 8 g N Pace werzlegfzflclenwre,

Feb. 13, 1945. P, c, MOLEMORE 2,369,154

- FLAME CULTIVATION OF PLANTS Filed May 8, 1942 4 Sheets+$heet 3 v [Z IINVENTOR.

fiiclemore BY Feb. 13, 1945. R MCLEMORE 2,369,154

FLAME CULTIVATION OF PLANTS Filed May 8, 1942 4 Sheets-Sheet 4 .@6- 1 fr T f H Patented Feb. 13, 1945 UNITED STATES PATENT OFFICE 2,809,154FLAME CULTIVATION F PLANTS Price Chrenleigh McLemore, Montgomery,Application 8, 1942, Serial No. 442,206

. 82 Claims.

The present invention relates to the flame cultivation of plants. Thedisclosure of this application embodies improvements upon thedisclosures of my prior. Patent No. 2,327,204, issued August 17, 1943,and niy prior application Serial No. 364,140, filed November 4, 1940.

My improved flame cultivation appears to have its principal field ofutility in the cultivation of cotton plants, but the invention is alsoapplicable to the cultivation of other crops, such as corn, legumes,potatoes, tomatoes, sugar cane, ramie, and even to crops such as beets,pineapples, etc. It may be applied to the cultivation of annual plantsor perennial plants, and even to such types as bushes and trees ifdesired, particularly when it concerns the problem of suppressingvolunteer vegetation such as weeds of casual or incidental plants, asagainst those intended to constitute the crop or to furnish the crop.Furthermore, while the apparatus herein disclosed is particularlyapplicable to thecultivation of row crops, the invention in its broaderaspect is not limited to row crops, as will be apparent hereinafter.

In my aforementioned prior applications, I have disclosed an improvedmethod of and apparatus for the cultivation of plants which proceeds onthe discovery that there is a marked difference in the resistivity ofplants to the application of heat, particularly heat at high tem-'perature. I have found that by the application of heat under suitablecontrol as to time, temperature, volume, and point or region ofapplication, certain of the varieties in a stand of vegetation of mixedcharacter may be selectively destroyed. The useful application of theprinciple involved in my invention resides not so much in the naturalresistance to hotter or colder climates of different kinds of plants orvegetation, but rather in the different effect of, or reaction to,suddenly or rapidly applied heat, particularly at high temperatures;that is, applied at a high temperature diiferential. :Such a pmcess iscomparable to singeing. The shape of a blade of grass is such that itpresents a large area for a given volume, and also, each point in itscross section is at only a minimum distance from the surface. Hence whena flame is applied to both rass blades and to a stemmed crop plant, the

. may also be projected along the middle areas hetween plant rows. Forthe cultivation of crops such as cotton, corn, etc., the cultivatingvehicle is preferably a high wheeled tractor of the cultivator typecapable of straddling two plant rows.

However, for .the cultivation of trees, orchards, high bushes, etc., itwill be apparent that various other types of tractors or vehicles may beemployed. 1

One of the features of the present application resides in the employmentof improved burners of the high pressure, atomizins type for projectingthe cultivating flames. The hydrocarbon fuel is fed to each burnerunderpressure and is. pro- Jected therefrom in the form of a highpressure let. A source of compressed air is also fed to each burner andis projected therefrom in atomizing relation to the jet of fuel. Thefuel can be distillate, furnace oil, or any one of a wide range of fueloils capable of being atomized and burned in the above manner. The highpressure atomizing type of burner is particularly advantageous ineffecting flame cultivation of plants because .it enables practicallyany desired length and shape of flame to be obtained, and because italso enables the intensity or temperature of the flame to be adjustedthrough a relatively wide range. In many instances it may be desirableto employ a relatively long flame for reaching in under long overhangingleaves orbranches of the crop plant so as to cause the flame to impingeagainst the' ground all around the base of the plant without injuriouslysearing these overhanging leaves or branches of the plant. Furthermore,it may be desirable to make the flame of fan shape or fishtailshapecharacterized by a wide horizontal span or dimension capable of coveringa considgrass may be cooked. scorched or burned before erable area ofground, and a relatively short vertical dimension so as to minimize thelikelihood of injuriously burning the upper leaves or foliage of thplant. These attributes of long length of flame and flat shape of flameare readily obtainable in my improved structure by the use of highpressure atcmizing burners and by the use of particular shapes burnernozzles, as I shall presently describe.

The pressure type of atomizing burner also enables the intensity .ortemperature of the flame to be adjusted over a relatively wide range.'There are a wide variety of conditions when the ability stalks capableof'standing higher temperatures it may be desirable to greatly increasethe intensity of the burner flames. The nature of the weeds, grass orother parasitic vegetation may also be a factor calling for differentintensities of flame. In many instances, the flame may produce a desiredinhibiting action on future growth to grow rapidly after the flaming.

"same.

of the obnoxious vegetation without killing the For example, some weedsand grasses which are not killed by the flaming never seem among theseare ragweed, amaranthus (pigweed), and dew grass. volume of flame,intensity of flame, etc., can be readily proportioned in my improvedflame cultivator by varying the pressure maintained in the fuel oilreservoir, by. varying the pressure in th compressed air reservoir andpossiblyJoy controlling the valved flow to the burners. The apparatus ofmy invention includes an air compressor mounted on the tractor anddriven from a power take-off of the tractor, this compressor maintaininga relatively high pressure on the fuel oil in the fuel reservoir, andalso maintaining a relatively high pressure in the compressed airchamber. As illustrative of very successful operating conditions, I findthat a pressure of approximately 40 lbs. on the fuel and the pressure ofapproximately 60 lbs. in the air tank give very good results, althoughit will be understood that the successful practice of the invention isnot essentially limited to these-pressures.

Another feature of the invention resides in an improved staggered oroffset relation between the burner flame projected from opposite sidesof each plant row. That is to say, the burner on one side of a plantrowprojects its flame substantially transversely of the row in a forwardposition and the burner on the other side of the plant row projects itsflame substantially transversely of the row in a rearward position sothat the area of flame is distributed over a longer length of plant row,and whereby each point in the plant row is subjected to flame for agreater length of time.

Anotherfeature of the invention resides in an improved relation ofburners for flaming the middle areas between plant rows and the side.areas beyond plant rows.

Another feature of the invention resides in providing separatesupporting wheels for the different burners or combinations of burnerswhich are capable of rising and falling relatively to the tractor flamein traveling along the plant rows. Each of these independent supportingwheels is located in immediate proximity to its respective burner andfollows the contour of the ground immediately adjacent that burner sothat the burner is maintained at a substantially con- Included Thelength of flame,

A typical weevilinfested cotton field will have boll weevils in allstages of development, such as the punctured or egg infested squares ofthe plant, the larvae, and the adult weevils. Practically all of theadult weevils and practically all.

ofthe cotton lice are to be found in the growing cotton plantsthemselves. The greater proportion of the punctured or egg infestedsquares are also to be found in the plants and beneath'the plants,although a small proportion of these punctured or egg infested squaresmay also be distributed over the middle areas of ground between theplant rows. Accordingly, it is seen that most effectiveinsectelimination is exercised of the plant down on to the ground where thecultivating flames can exert their destructive action on theseparasites. Accordingly, my improved flame cultivator comprises improvedmeans which first vigorously agitates the plants along the plant row atpoints substantially in advance of the burners, so that the weevils,larvae and squares will have fallen to the ground by the time the burnerflames reach that particular area of the ground.

Another feature of the invention resides in the provision of improveddeflectors which tempostant height above the ground irrespective ofirregularities in the ground or any tilting of the.

tractor frame.

Another feature of the invention resides in improvements which increasethe effectiveness of the cultivator for insect control. One of the veryimportant advantages of cultivating-cotton by the flame method is thelargescale destruction of boll weevils and cotton lice by the flames.

rarily lift the lower leaves or foliage of long-' leaved plants toelevated position so as to hold them up out of the direct paths of. theflames issuing from the burner nozzles. Such leaf lifting deflectors maybe employed advantageously when cultivating tobacco, corn and other longleaf plants, particularly at that stag of their growth when the lowerleaves hang down in close proximity to the ground.

Oher features, objects, and advantages of the invention willappear fromthe following detail description of certain preferred embodimentsthereof. trating such embodiments:

Figure 1 is a side elevational'view, more or less diagrammatic, of atractor having my improved fiame cultivator apparatus mounted thereon;

Figure 2 is a front elevational view of .the cultivator showing theagitating chains at the front of the vehicle for shaking the plants toshake of! insects, larvae, etc.;

Figure 3 is a front view of the cultivator taken on'a plane immediatelyin rear of the agitating chains, approximately as indicated by thesection plane 33 of Figure l;

Figure 4'is a plan view of the cultivator; Figure 5 is a rear end viewof the same; Figure 6 is a longitudinal sectional view, somewhatdiagrammatic, through one form of my improved high pressure atomizingburner;

Figure 7. is a fragmentary front elevational' view of a modifiedconstruction of my invention, this view corresponding approximately to aview taken on the plane of the line 1-1 of Figure 8;

Figure 8 is a fragmentary plan view of this modified construction;

Figure 9 is a fragmentary side elevational view, corresponding to avertical section taken approximately on the plane of the line 9-9 ofFigure 8;. Figure 10 is a detail elevational view of one In theaccompanying drawings illusof the adjustable mounting clamps formounting the burner units; and

Figure 11 is aview similar to Figure 6, showing a modified constructionof burner uni-t.

Referring first to-Flgures 1 to 5 inclusive, I have shown a tractor 2iof conventional 0021- struction uitable for performing ordinarycultivating operations. The tractor comprises a single dirigible wheel22 or two closely spaced dirigiblewheels'at the front, and drivingwheels 23 at, the rear. The front wheel or wheels 22- are steered by asuitable steering mechanism including the steering wheel 24 whichrotates a steering spindle inthe front post 23 to swivel the wheel 22.The front and rear wheels are connected this frame are the internalcombustion engine, clutch, selective speed transmission and drive to thetwo rear wheels 23. The tractor is preferably provided with an automaticspeed governor which can be set to maintain any desired fixed tractorspeed, as is well known in the art. The operator's seat." is disposedadjacent to the rear end of the tractor where the operator can haveclear. forward vision of the plant rows and the re-- lation of theburners to the plant rows. A'power take-off shaft projecting from therear end of the drive housing 3| is adapted to drive the air compressor,as I shall later describe. These cultivator tractors have their rearwheels 23 spaced sufficiently far apart to straddle two plant rows whenoperating on row crops, these two rows being indicated by the dash anddot lines It and R in Figure 4. The sp'an between such rear wheels isusually adjustable for adapting the implement to the cultivation-ofcrops having different row spacing. The front steering wheel 22 run be?tween the rows R and R.

This type of tractor has provision for mounting an implement carryingrock shaft 33 extending crosswise at the front end of the tractor.Mounting brackets 34 are detachably secured to the forward portion ofthe tractor frame 21 and the front endsof these brackets carry suitablejournals 33 in which the rock haft 33 is mounted endwise slidingmovement'in a tubular guide by a suitable chassis frame 21, and carriedby bracket 48 which is bolted to the rock shaft 33. The operatingrelation is such that the rod 41 can slide upwardly and downwardlywithin the tubular guide bracket 48, and a compression spring 43surrounding the lower portion of the rod normally tends to thrust therod downwardly to hold the. supporting wheel 44 against the ground underspring pressure. The upper end-of the spring abuts theunder side of thetubular guide 48 and the lower end of the spring abuts an adjustablecollar 5!, suitablysecured to the arm 41 by a set screw or the like,whereby the collar M can be positioned upwardly or downwardly along thebar 41 for increasing or decreasing the effective pressure of the spring49. A stop collar 52 is secured to theupper end of the bar 41 and isadapted to strike the upper end of the guide sleeve 48 for limiting thedownward or outward movement of the bar 41, particularly when these barsand their burner units are swung upwardly to their nonoperatingpositions. burner 4 I4I' and 4242' has adjustable-mounting on itsrespective wheel supp'orted bar 41 through the instrumentality of anadjustable mounting bracket 54 adapted to be secured by a bolt or bolts55 to the bar 41. This adjustable operatively connected through a link38 with an arm 38 extending from the rock shaft 33, whereby swingingmotion of the manual lever 38 is operative to swing the burner unitsfrom a lower operative position to an upper nonoperating position.

There are at least four burner units for the two plant'rows RR', onepair of burner units 4l4l being disposed on the outer sides of saidplant rows and another pair of burners 42-42 being disposed on the innersides of said plant rows. These burners are supported by independentsupporting wheels 44 which can rise and fall relatively to the tractor21 in following the contour of the ground. These four supporting wheels44 have practically the same operative connection with the rock shaft33, and, accordingly, a description of one of these supporting wheelsand its operative connection will suillce for all. Each wheel isjoumaled on an axle pin 43 projecting laterally from a bracket 48 whichhas bolted attachment to the lower end of a spring impelled loweredrelatively to its individual supporting wheel 44, andalso enables thefore and aft and transverse angles of inclination of the burner to beadjusted relatively to the ground. As best shown in Figures 1 and 4, thetwo companion burners for each plant row are preferably set in astaggered or oifset relation, wherein the flame from one burner is setforwardly in advance of the flame of the other burner so that the twoflames act in series on the plant row. Thus, in

the arrangement illustrated inFigure 4 the two inner burners 42 and 42'are set in advance of the two outer burners 4| and 4 I so that the plantrows are first flamed by the inner burners and then flamed by the outerburners. This reduces the intensity of the flame to which each plant issubjected at any instant of time, but increases the time interval overwhich the plant is subjected to the flames. It will be evident that asthe separate supporting wheels 44 pass over undulations in the groundthey cause up and down movement of the spring pressed mounting rods 41and correspending up and down movements of the burner units so that theunits are always maintained a Positioned forwardly of the burners 4I-42and 4l'-42' are the agitating devices which shake the crop plants forcausing insects,- larvae and other parasites to drop down to the groundWhere they will be subjected to the flames from the burners. Theseagitating devices preferably comprise chains 61 which hang from atransversely extending front supporting bar 62. This bar 62 is supportedfrom the front end of the tractor in any suitable manner, such as byhaving extension arms 34' project forwardly from the spaced supportingbrackets 34 for supporting the bar 62 at laterally spaced points. Figure2, the chains 6! hang down from the bar .62 in relatively close spacingso as to agitate all larvae and other parasites on the plants are shakenloose and are caused to drop to the ground Each As shown in I thechains. These agitating chains have par-= ticular utility incultivatingcotton plants, where the agitation of the chains has a verybeneficial effect in shaking loose from theplants a goodly proportion ofthe boil weevils, punctured or egg infested squares, cotton lice, etc.

Each of the liquid fuel burners 4I-4I' and 4242 is of the 'high pressureatomizing type, such as is diagrammatically illustrated in Figure 6.Each burner comprises an atomizing chamber 65 from which extends aburner nozzle 88. The liquid fuel enters the atomizing chamber 65 underpressure through a fuel tube 81 which terminates in a fuel orifice ornozzle 61'. Compressed air enters the atomizing chamber 65 through anair tube 68 which terminates in an air orifice or nozzle 68'. This airorifice 88' is so positioned with respect to the fuel orifice 61' thatthe blast of air issuing therefrom exerts a pronounced atomizing effecton the fuel issuing from the fuel orifice. If desired, the capacity ofthese orifices may be made variable, through the substitution ofdifferent calibrated orifice plugs, or adjustable metering pins may beprovided to vary the area or each orifice. In the preferred arrangementillustrated, I provide a cock or valve H at the upper end of the fueltube 81, and provide a cock or valve 12 at the upper end of the air tube68. These valves maybe employed for regulating purposes or for shut-offpurposes. A rubber tube or other flexible tube 14 establishes acommunication between the admissionside of each valve 1| and atransversely extending fuel manifold pipe 15. This manifold pipe extendstransversely of the tractor adjacent to the rock shaft 83, and

supplies fuel to all of the burner units. A similar air manifold pipe 18also extends transversely of the tractor adjacent to the fuel manifoldpipe 18. Sections of rubber tubing or other flexible conduit 11 extendfrom this air manifold pipe to the admission side of the valve 12connecting the system. The air supply pipe 18 connects with any desiredpoint of the air storage tank 82, preferably adjacent to the upper endthereof as shown in Figure 5. A relief valve 88 opens from the bottom ofthe air reservoir 82, this valve also serving to drain any condensatefrom the bottom of the reservoir 82.

.The air compressor 8| is preferably a four cylinder, V-type ofcompressor which is shown as being mounted under the driver's seat 28..A power take-up shaft 82 projects from the. rear end of the drivehousing 8|, and is operatively coupled with the air compressor 8|. Inthe preferred arrangement illustrated, the drive is effected by mountinga sprocket wheel 88 on the power take-off shaft and by mounting asimilar sprocket wheel '88. on the compressor shaft, and connectingthese two sprocket wheels with the drive chain 88. A protecting housing88 encloses the sprocket wheels and drive chain. The power take-oi!shaft 82 can be connected to and disconnected from the engine of thetractor at anytime, as is well known in these cultivating types oftractors. An air filter 88 is secured to the chain housing cover"88 andsupplies cleaned air through the intakemanifold's 88 to the fourcylinders of the with the air jet tube 88. The provision of the sectionsof flexible tubing 14 and I1 accommodate the rise and fall of the burnerunits as their supporting wheels pass over undulations in the ground,and also accommodate the upward swinging movement of the burner unitswhen the burners and their supporting wheels are swung upwardly to theirnonoperating positions.

A fuel supply pipe 18 extends rearwardly from the fuel manifold 18, andan air supply pipe 18 extends rearwardly from the air manifold 18. Thesetwo supply pipes connect respectively with a fuel supply tank H and anair supply tank 82, both of which tanks are preferably mounted inupright relation at the rear of the tractor to the left and right sidesof the tractor seat 28,

. as best illustrated in Figure 5. The lower ends of the tanks arerigidly clamped in mounting sockets 'or mounting steps 88 which aresuitably secured compressor, The outlet-manifold IOI leading from thecompressor cylinders conducts the compressed air through an after-coolerI02 which serves to reduce the temperature of the compressed airbeforeentering the air reservoir 82..

A check valve I08 is interposed in the pipe connection I08 leading fromthe after-cooler to the air tank 82. A pressure transmitting pipe I08extends across from the top of the air tank 82 to the top of the fueltank .8I. An adjusting or regulating valve I01 is interposed in thispipe for controlling the pressure transmitted from the compressed airtank to the fuel tank. This valve I01 is preferably a manually adjustedvalve, although I also contemplate the use of an automatic adjustablepressure regulating valve, if desired. It will be noted that the valveI01 is in immediate access to the operator from his position on thetractor seat 28. A pressure gauge I08 to the axle extensions 84 of'thedrive housing 3|. The :fuel supply pipe 18 connects with the lowerportion of the fuel tank 8| through a valve 06 which is readilyaccessible. to the operator from his position on the tractor seat 28,and whichvalve may'serve as a shut-off valve or as a regulating valve.whereby the operator may shutoff the entire flow of fuel to all of theburner units at any time, or may regulate the total fiow to the burnerunits at any time. Also interposed in the supply line 18 is a suitablemoisture trap and outlet 81 which traps moisture and condensation andenables it to be readily drained from I08 on' the air tank side of thevalve I01, whereby this gauge I08 always indicates the pressure existingin the air tank 82. Similarly, another pressure gauge I08 is, connectedto the pressure transmitting pipe I08 on the fuel tank side of thepressure regulating valve I01 for indicating.

the pressure prevailing in the fuel tank 8|. A pressure relief valve IIImay also be connected with the fuel tank 8I so as to prevent possibilityof an abnormally high pressure arising in the tank 8|; The liquid fuelis introduced into the tank 8| through a suitable fuel inlet IIZ havingashut-oil' valve H8.

It will be seen from the foregoing that the operator can run thecompressor SI for longer or shorter intervals and thereby increase ordecrease the pressures prevailing in the tanks 8i and 82 over a widerange of adjustment. It will also be seen that the operator canestablish and maintain-any desired pressure differential between thetanks 8| and 82 by opening and closing the valve I01. By the performanceof these regulating operations, and the performance of the otherregulating and adjusting operations previously described, the operatorcan readily vary the intensity of the burner flames through aconsiderable range, and can also vary the length of the burner flamesthrough a substantial range. Under average operating conditions,

flame this can be done by reducing the pressure prevailing in the fueltank Iii. Furthermore, if it is desired to increase or decrease thelength of the flame projected from each bumer unit, this can be broughtabout by increasing or decreasing the two pressures prevailing in thecompressed air tank and the fuel tank 3 I, the higher pres suresresulting in a longer flameand the lower pressures in a shorter flame.It will thus be seen that the operator can adjust the intensity of theflame and the length of flame to meet all crop conditions, ranging froma low intensity flaming for young crops, to a high intensity flaming formature crops having relatively thick stalks, and also ranging from arelatively short flame for young crops to a relatively long flame forreaching in under mature crops having long leaves or long upper foliage.Under all of these variable operat ing conditions, the burner flame ismaintained in a relatively fixed relation to the bases of the cropplants by reason of the mounting of the burner units on the separatesupporting wheels 44. When the tractor is being run to and from thefleld, the burner units and supporting wheels H can be when it isdesired to reduce the intensity'of the swung up to inoperative positionsraised considerably above the ground. When the burner'units andsupporting wheels have been swung down to operative position, travelingalong the ground, the adjustment afforded through the lever 36 may, ifdesired, be utilized-to incline the spring pressed rods 41 forwardly orrearwardly. to a greater or lesser angleto insure free rise and fall ofthe spring pressed rods in the travel of the wheels 44 overirregularities in the ground level.

Referring now to the modified construction illustrated in Figures 7 to11 inclusive, this modifled embodiment differs from the precedingembodiment principally in the feature of having the independent wheelsupports for the burner units pivotally mounted soas to be capable of anup and down swinging movement instead of an endwise sliding movementwhen passing over irregular ground; also, in the feature of having theburner units project a fan shaped or flshtail flame; and, furthermore,in the feature of providing leaf lifting devices for lifting the lower i.leaves or foliage of the crop plants up out of the direct path of theflames issuing. from the burner nozzles. The construction of the tractor2| and the arrangement of the various parts thereon is substantially thesame in the case of this modified embodiment, and hence the descriptionof that portion of the disclosure need not be repeated. The bracket arms34 extending forwardly from the tractor carry the transversely rockshaft 33, and extensions 34' of these bracket arms project forwardly formounting the rod 62 and chains 6|, substantially as heretoforedescribed. Each independent supporting wheel 44 is journaled on thelower end of a supporting arm I2I which has its upper end journaled forfree swinging movement about the rock shaft 33. As best shown in Figure.'1, each arm 'l2l has its upper end securedin'the lower portion of amounting yoke I22 the arms of which are formed with split bearings I23adapted to be mounted over bearing bushings I24. The bushings have wideouter grooves formed therein, and the split bearing bosses I23 areassembled in these grooves for rotation therein. Stop collars I26 aresecured to the rock shaft 33 by set screws I21 or the like fordetermining the lateral position of each yoke I22 along the rock shaft83. It will be understood that by loosening the set screws I21 in thestop collars I26 the entire yoke and arm assembly can be shiftedtransversely to different positions along the rock shaft 33- if itshould be desired to adjust the lateral position of one or more burnerunits to accommodate different row spacing of thecrop plants or todispose the burners closer to or further from the plants. A lifting armI28 extends downwardly from a hub I29 which is'mounted on the rock shaft33 between the arms of the yoke I22. The

hub I28 is free to slide endwise along the shaft 23 in the performanceof any shifting adjustments of the yoke along the shaft, but said huband lifting arm are compelled to rock directly with'the shaft 33, s1 ichresult being obtained either by forming the'rock shaft of polygonalcross section or by providing a sliding key or spline arrangementbetween the rock shaft and the hub I29. Asshown in Figure 9, the liftingarm I28 normally occupies a position spaced rearwardly from the yoke I22and arm l2l, so that the arm I2l is-free to swing up and down with thewheel 44 as the latter passes overun'even ground. However, when theoperator desires to swing the burner units'and their wheel supports upto a nonoperating position, as when driving the tractor to or from thefield, he actuates the hand lever 36 in the same manner previouslydescribed for rocking the rock shaft 33 in a counterclockwise direction.'This swings the lifting arms I28 forwardly for positively raising allof the wheel supported arms l2l upwardly to their nonoperatingpositions. Each of these wheel supported arms I2I is preferably ofcylindrical tubular cross section, and has its lower end curvedforwardly and bent laterally to form a journal onwhich the ground wheel44 is mounted. These arms I2I are shown as being inclined in a forwarddirection in order to dispose the burner units 4l-H' and 42-42considerably in advance of the pneumatic tire on the front tractor wheel22, but my invention also contemplates an alternative arrangementwherein the arms I2I are inclined downwardly in a rearward directionfrom the axis of the rock shaft 33, particularly where this rock shaftis disposed further forward, or where the entirefront tractor wheel 22is of such construction, or is laterally shielded in such manner, thatthe heat of the burner flames will not injure this wheel. As eachsupporting .and can also be swiveled horizontally to different angularpositions around the axis of this arm.

Figure 10 illustrates .a typical clamping type of mounting which enablesthe burner unit to have these adjustments relatively to said arm. The

its entirety, and comprises a first clamping section I3I which clampsaround the arm I2I, and a 'second clamping section I32 which clampsaround'the burner unit. The section I3I is of split formation formedwith ears I33 projecting forwardly from each semicircular half andadapted to'receive clamping bolts I34. This arrangem'ent enables thesection 'I3I to be slid up -to dispose the fan-shaped burner nozzle 66aat different angles. Projecting from the first clamping section I2I, atan angle thereto, is a substantially circular clamping boss I31, andprojecting from the second clamping section I32, at an angle thereto, isa companion boss I30. These two bosses are formed with circularly formedclamping faces provided with radially extending serrations I31 and I38respectively which are clamped in matching relation by a clamping boltI39 passing through the two bosses. Releasing this bolt enables thesecond clamping section I32 to be swiveled upwardly or downwardly aroundthe axis of the bolt I39, thereby enabling the vertical angle of theburner unit to be turned upwardly or downwardly for directing the burnerflame more obliquely or less obliquely to the surface of the ground.

This modified embodiment illustrates the prei'erred construction ofburner unit wherein the nozzle i of fan-shaped or flshtail outline, asindicated at 66a. This form of nozzle is advantageous forv the purposeof producing a flame which is of considerable width horizontally forcovering a large area of ground. but which is of relatively shallowdepth vertically so as to minimize injury to the lower leaves and lowerfoliage extending outwardly from the crop plants. Figure 11 illustratesthe slightly modified form of atomizing chamber 85a which may beembodied in any of these burner units. In this modified construction,the liquid fuel enter the upper rear portion of the atomizing chamberthrough fuel tube 61a terminating in fuel orific 61', and the compressedair enters the upper portion of the atomizing chamber through air tube68a ter- -minating in air Jet 68'. The rear end of the atomizing chamberis formed with an oblique deflecting surface I40. The air orifice 60'discharges across the end of the fuel orifice 01' and impinges at anangle on the deflecting surface I40. The construction and arrangement issuch that the stream of air issuing from the-air orifice exerts apronounced atomizing efieci; on the streamof fuel issuing from the fuelorifice at right angles thereto, this mixture of air and fuel thenstriking the deflectingsurface I40 and being deflected at a downwardinclination through the fan-shaped nozzle 88a. The impingement'of theair and the fuel particles against the inclined deflecting surface I40causes the fuel particles to be subjected to further atomization, and.in ad- ,dition, the striking -of the stream of air and fuel againstsuchsu'rface tends to fan the stream outwardly in sidewise relation toaid informing the 2,309,154 clamp or mounting bracket is designated I30in flshtail-shape' of flame issuing from the nozzle 80a. While themodified construction of burner illustrated in Figure 11 is thepreferred construc-' tion for average working conditions and averagetypes of plants, other working conditions or other types of plants maymake it advisabl to employ the circular type of burner nozzle 88 inconjunction with the deflecting type of atomizing chamber 35a, or toemploy thecfan-shaped nozzle 06a in conjunction with the straightatomizing chamber 65, if desired. a

Referring to Figure 8, I have shown the same previously describedarrangement of outer and Y inner burners 4i and 42 for the left handplant row R, and outer and inner burners 4| and 42" for the right handplant row R. The inner and outer burners of each pair are likewisearranged instaggered or oflset relation, preferably with the innerburners 42, 42' disposed forwardly of the outer burners 4|, 4|",although this arrangement may be reversed if desired. The degree ofoffset between the burners is preferably such that the rear edge of thefan-shaped flame of the front burner approximately coincides with theforward edge of the fan-shaped flame of the rear burner. This results inthe burners covering a maximum expanse of horizontal area along. thecrop row,

with a minimum vertical depth of flame. Figure '7 illustrates thepreferred setting of the burners for average crop and soil conditions,with the burner flames striking the ground short of the plant and thenfanning out beyond the plant or around it. g

The modified embodiment shown in Figures '7 to 11 inclusive, alsoillustrates the provision of additional burners arranged to flame themiddle areas between the plant rows. These middle areas will be flamedto some extent by the transversely extending burners 4I4I', 42-42, butthe middle areas may be flamed more intensively by providing additionalburners devoted primarily Y to those areas. Such additional burners aretypically illustrated at I4I--I4I' and I42-I42' in Figures 7 and 8.These latter burners can be identical in all respects with thetransversely extending burners, the only difference being of the angleof mounting on their respective wheel supported arms I2I. This angle isin a more or less forward direction, with the fan-shaped flamesconcentrated more directly on the middle areas between the plant rows,as clearly shown in Figure 8. The flaming of the middle areas destroysor inhibits the obnoxious vegetation in theseareas, and also acts on asmall percentage of the boil weevils, larvae, punctured or egg infestedsquares, cotton lice and other parasites which may be lying on theground in these middle areas.

In this modified embodiment illustrated in Figures 7 to 11 inclusive, Ihave also shown leaf lifting devices for raising the lower leaves oflong leaved plants so as to get these leaves up out of the direct pathof the flames issuing from the burners. An outer leaf lifter I5I followsalong the outer side' of each plant row, and an inner leaif lifter I 32'follows along the inner side of each to raise the lower'leaves of theplant to a plane above the flames projected transversely by thestaggered burners ll-fl, 4 l '--l2'. The rear end of the lifter canslope downwardly, if desired, at a point beyond the transverse plane ofits associated burner. Each leaf lifter may be arranged for independentmounting on the adjacent wheel supported arm l2! through the medium ofan adjustable mounting bracket, if desired, but a more simplifiedarrangement is to mount each leaf lifter on its associated burner unit.This can be readily accomplished by riveting or welding bars i5! to thenozzle 66a of each transverse burner, and having these bars extendoutwardly and upwardly for attachment to the leaf lifter at pointsapproximately in prolongation, of the burner nozzle. This mounting willinsure that each leaf lifter will remain in a predetermined relation toits respective burner unit in any'adjustment of the burner unit. Asshown in Figures 'I and 8, the two leaf lifters at each side of eachcrop plant move in under the long lower leaves and lower foliage of theplant and gradually deflect these leaves and foliage upwardly so thatthe transverse burners can project their flames against the bases of theplants and over the adjacent ground without having these lower leavesand lower foliage in the direct path of the flames where they might bedeleteriously' burned by the flames. It will also be noted that the twoleaf lifters I51 and I52 cooperate to form a guiding throat forstraightening up plants which may be leaning to one side, and fordeflecting plants which are substantially out of line in the plant row'back to a positlon more nearly in line, whereby to properly positionall of the plants for the most eflfective action of the burner it may bedesirable to flame the plant rows. or hills immediatelyafter plantingand before the plants have come up. w

While I have illustrated anddescrlbed what I regard to be the preferredembodimentsof my invention, nevertheless it will be understood that suchare merely exemplary and that numerous modifications and rearrangementsmay be made therein without departing from the essence of the invention.

I claim:

1. In a flame cultivator for eradicating weeds from row crops by theflame method, the combination of a wheeled vehicle adapted to travelalong a plant row, fuel supply means on said vehicle for supplyingliquid fuel under pressures of approximately pounds'per square inch, airsupply means on said vehiclefor supplying compressed air under pressuresof approximately 60 pounds persquare inch, a plurality of high pressureaitomizing burners propelled by said vehicle and having a fuel nozzleconnected to receive liquid fuel under pressure from said fuel supplymeans and having an air nozzle connected to receive compressed air fromsaid air supply means, said air nozzle exerting an atomizing action onthe fuel from the fuel nozzle in each burner and also creating a longflame, said burners being arranged to project relatively long flamesuponthe ground on opposite sides of the plant row and directed generallycrosswise of the plant row whereby said long flames pass through andbeyond the plant row for destroying weeds directly in the plant flameson the bases of the plants and the surrounding ground areas. These leaflifters are of' particular advantage in connection with tobacco, cornand other long leaved plants, but need not be employed in connectionwith these crops or other crops when the leaves are short and do not getinto the path of the burner flames.

My improved cultivator can also be used on pineapple plantations. and inother situations where paper'is used'to control weed growth. Tests haveproven that celery paper will not be ignited by the burner flames.require that the burner flames be reduced in intensity, but the widerange of adjustment which can be obtained by my improved regulatingapparatus makes this entirely practicable. The wide range of regulationof the intensity and size 'of the burner flames can also be utilized tocom- Other papers may .rows, a fuel reservoir on pensate for windconditions. The speed of the 1 tractor can be widely adjusted byvariation of the governor setting, and by the selection of differentspeed ratios in the transmission, so as to increase or decrease thelength of time that each crop plant is subjected to the action of theflame. For example, with a typical tractor having a three-speed orfour-speed transmission, a variety of speeds ranging from V2 mile perhour to 4 or 5 miles per hour can be had for a wide variety of typicaloperating conditions. Different types of crops, different stages ofinsect life, different types of weeds andgrasses, different seasons andstages in the life of the crop and other related factors create a widevariety of operating-conditions, to all of which my improved implementcan be adapted. Under certain operating conditions row, and regulatingmeans cooperating with one of said supply means for controlling theintensity of flame or length of flame projected from each burner. i

2. In a cultivator adapted to cultivate row crops by the flame method,the combination of a tractor having a front wheel traveling betweenadjacent row and rear wheels spanning adjacent said tractor, a;compressed air reservoir on said tractor, means driven by the tractorengine for maintaining pressures in both of said reservoirs, a'pluralityof high pressure atomizing burners connected with the forward portion ofthe tractor and receiving fuel and air under pressure from saidreservoir, said burners being arranged to project relatively long flamesupon the ground on opposite sides of adjacent plant rows straddled bythe tractor and directed generally plant rows, and regulating meanscooperating with one of said reservoirs for controlling'the length orintensity of flame projected from each burner.

3. Apparatus for eradicating weeds from row crops by the flame methodcomprising a vehicle adapted to travel along the plant row, a pluralityof burners propelled by said vehicle and disposed on each side of saidrow in position to project flames substantially crosswise of the plantrow, and means carried by said vehicle for supplying liquid fuel and airto separate fuel and air nozzles in said burners under pressures ofapproximately 40 pounds for the fuel and 60 pounds for the airwhereby-to atomize the liquid fuel at each burner and to cause eachburner to project a relatively long flame which is directedsubstantially crosswise of the plant row to pass through and beyond theplant row at a level below the lower leaves of the crop groundimmediately around the bases of the crop plant.

toward the plantsin the two plants for flaming the I foliage of thes forsupplying fuel to said 4; In a cultivator adapted to cultivate row cropsby the flame method, the combination of wheeled vehicle, a burnerdisposed angularly with projecting their'flames substantially crosswiseof respect to the plant row projecting a long flame crosswise oithe'plant row whereby said long flame passes through and beyond theplant row to act on weeds in the row in the travel of said vehicle,means On said wheeled vehicle for supplying fuel to said burner, and awheeled support for said burner coupled to said wheeled vehicle wherebysaid burner is propelled by said vehicle but can rise and fallrelatively thereto in the travel of its wheeled support over the ground.

5. In a cultivator crops by the flame method, the combination of atractor having a front wheel traveling between adjacent rows and rearwheels spanning adjacent rows, a plurality of burners positioned betweensaid adjacent rows and on the outer sides of said adjacent rows andprojecting flames upon the ground or adjacent to the bases of the plantsadapted to cultivate row in said rows, means on said tractor forsupplying fuel to said burners, separate supporting wheels for each ofsaid burners, and means coupling said separate supporting wheels withsaid tractor whereby each burner and its separate supporting wheel canrise and fall relatively to saidtractor and to the other burners incultivator over uneven ground.

6. In apparatus of the class described, the combination of a wheeledvehicle, a burner propelled by said vehicle adapted to project a flamein predetermined relation to the crop in the travel of said vehicle,means on the vehicle for v said burner, and a separate wheeled supportfor said burner comprising an supplying fuel to arm having endwiseslldable connection with said wheeled vehicle, a separate supportingwheel at the lower end of said arm, and spring mean acting on said armnormally thrusting said separate" 40 supporting wheel against theground.

7. Inapparatus of the class described, the combination of a wheeledvehicle, a plurality of burners propelled by said vehicle adapted toproject flames in predetermined relation to the crop' in the travel ofthe vehicle, means on the vehicle burners, and separate wheeled supportsfor .said burners each comprising an arm pivotally mounted on saidwheeled vehicle for up and down swinging movement, and a ground wheel atthe lower end of each arm capable of rising and-falling relatively tothe wheeled vehicle and to the other burners, whereby each burner ismaintained at a substantially the travel oi the fixed height above theground during the travel of the vehicle over uneven ground.

8. In a cultivator adapted to cultivate row crops by the flame method,the combination of a wheeled vehicle adapted to travel along the plantrows, and a pair of burners propelled by said vehicle and adapted toproject flames substantially crosswise of the row in the travel of thevehicle along the row, said burners being in staggered relation wherebythe flame from one burner acts on the plants or ground area of the row,in advance of the flame from the other burner.

9. In a cultivator adapted to cultivate row crops by the flame method,the combination of a tractor having a front wheel traveling betweenadjacent rows and rear wheels straddling adjacent rows, a pair of outerburners on said tractor positioned to travel along the outer sides ofsaid adjacent rows, and a pair of inner burners on said tractorpositioned to travel along the inner sides of said adjacent rows, saidburners said rows and the burners acting on each row being offset withrespect to each other whereby their flames act in series on the plantsin each 5 row. I

10. In an implement adapted to cultivate crops by the flame method, thecombination of a wheeled vehicle, and a burner propelled by said vehicleand operative to project a flame in predetermined relation to the crop,said burner being constructed and arranged to project a flame oirelatively wide horizontal dimension so as to cover a considerable areaof ground, and of relatively small vertical dimension so as to minimizethe likelihood of injuriously burning the upper foliage of the crop.

11. In a cultivator adapted to cultivate row crops by the flame method,the combination of a tractor adapted to travel along the plant row.

fluid fuel burners of the pressure type propelled by said tractor alongopposite sides of the plant row for flaming the ground around the plantsin said row, and means on the tractor for supplying fuel to saidburners, said burners being constructed and arranged to project afan-shaped flame over zontal dimension and of relatively small verticaldimension.

12. In a cultivator adapted to cultivate row crops by the flame method,the combination of a wheeled vehicle, a burner propelled by the vehicleprojecting arelatively long unobstructed flame substantially crosswiseof the plant row and entirely through and beyond the plant row for 85direct impingement against weeds in the plant row, and means carried bysaid vehicle for lifting the lower leaves of the crop plantssubstantially out of the path of said flame during the cultivatingoperation. a a

13. In a cultivator adapted to cultivate row crops by the flame method,the combination of 'a tractor having a front wheel traveling betweenadjacent rows and rear wheels spanning adjacent rows, a plurality offluid fuel burners propelled by said tractor and disposed at the outerand inner sides of said adjacent rows for projecting flames around thebases of the crop plants in said rows, and leaf lifting deflectorscarried by said tractor on the outer and inner sides of said plant rowsfor lifting the lower leaves of the crop plants in said-rowssubstantially out or the path of the flames from said burners as thecultivator travels along said rows.

14. In apparatus of the class described, the combination of a wheeledvehicle adapted to travel along plant rows, means carried by saidvehicle for shaking the plants to cause insects and other parasites tofall from the plants down to the ground, and a burner propelled by thevehicle operative to thereafter project a-relatively long unobstructedflame substantially crosswise of the plant row to pass through the plantrow for impingement against the ground directly under the plants todestroy such insects and other parasites.

15. The method of destroying or inhibiting i'nsects and other parasitesin row crop plants, which comprises shaking thecrop plants so as tocause the insects and other parasites to fall from the. plants down uponthe ground, projecting a relatively long unconfined flame substantiallycrosswise of the plant row to pass through and beyond said row wherebysaid long flam'e impinges directly against the ground substantiallyunder the plants to destroy or inhibit insects the ground of relativelywide horijury to the crop plan 8,869,154 a or other parasiteson theground under the plants,

and movlngthe flame along the row at a rate which will destroy or otherparasites without causing substantial inand projecting flamessubstantially crosswise of said rows, and burners propelled by saidtractor and positioned to project flames along the middle .areas betweensaid rows.

1'7. In a cultivator adapted to cultivate row crops by the flame method,the combination or a tractor having a rront wheeltraveling betweenadjacent rows and rear wheels straddling adjacent rows, a plurality ofbum'ers' propelled. by thetractor and adapted to project flames from theinner and outer sides of said plant rows around the bases of the plantsin said rows,and adjustable mounting clamps connecting said burners withsaid tractor whereby said burners can be inclined to difierent verticalangles and can be swiveled to diflerent horizontal angles.

18. In a cultivator adapted to cultivate row crops by the flame method,the combination oi a tractor having a front wheel traveling betweenadjacent rows and rear wheels straddling adjacent rows, a plurality ofburners propelled by the tractor and positioned on the outer and innersides of said ajacent rows for projecting flames around the bases of theplants in said rows, and means mounting said burners on said tractorenabling said burners to be adjusted transversely of the tractor toaccommodate difl'erent row spacing of diiierent crops.

.19. The method of treating astanding row of stemmed crop plants tosuppress insect life, on the plants which comprises agitating the plantsto cause the insectsto drop therefrom to the ground beneath the plants,directing relatively long unconfined side of the standing rowsubstantially crosswise oi the row to pass through and beyond thestanding row, said blasts bathing the insects, the

vegetation, and the stems of the standing crop plants in the hot fluid,and moving the blasts oi hot fluid along the row at a rate which willcontinue the application of heat longenough to injure the insect lifewithout substantial injury to the crop plants.

. 2D. In an lmplementadapted to remove weeds from plant rows by theflame method, the com; bination of a tractor, an air compressor drivenby the engine of said tractor, an air reservoir and. a iuel reservoir onsaid tractor, means for conduct ing compressed air from said compressorto said reservoirs, fluid fuel burners of the pressure type propelled bythe tractor, each oi said burners comprising a fuel row in the travel ofthe tractor, means for supplying fuel and compressed air from saidreservoirs to said fuel and air jets in said burners, and regulatingapparatus for governing the action oi inhibit such insects orjet and anair let, said air jet exerting a mechanical atomizing action on the saidburners comprising adjustable means for establishing a pressuredifferential between said reservoirs, and adjustable means for varyingthe rate of flow of fuel to said burners. 1

21. In an implement of the class described, the combination of a wheeledvehicle, a plurality of burners carried thereby adapted to projectflames in predetermined relation to a growing crop,

, means on said vehicle for supplying fuel to said burners, supportingarms for said burners, and

adjustable mounting clamps for adjustably mounting said burners on saidsupporting arms,

blasts of hot fluid from each each of saidmounting clamps comprising aflrst clamp section embracing a supporting arm and shiftable todifferent vertical positions and to diilerent angular positionsrelatively to said arm.

.a second clamp section embracing the burner and enabling the latter tobe rotated to different angular positions in said clamp section, andmeans adjustably coupling said clamp sections together in differentangular positions, whereby to provide a wide range of adjustment of thehumor. 1

22. In a cultivator adaptedto cultivate row crops by the flame method,the combination of a tractor having a front wheel traveling betweenadjacent rows and rear wheels straddling adjacent rows, a rock shaftextending transversely across the front portion 01 said tractor, meansoperative to rock said rock shaft, and burners carried by said rockshaft and disposed on the inner and outer sides of said adjacent rows toproject flames on the bases of the plants in said rows, the rocking ofsaid rock shaft being operative to swing said burners upwardly tononoperating positions.

23. In a cultivator adapted to cultivate row crops by the flame method,the combination of a tractor having a front wheel traveling betweenadjacent rows and rear wheels straddling said adjacent rows, a pluralityof burners on said tractor disposed on the outer and inner sides of saidadjacent rows and projectin flames on the bases of the plants in saidrows, a fuel reservoir on said tractor supplying fuel to said burners, acompressed air reservoir on said tractor supplying compressed air tosaid burners, and a compressor driven by said tractor for supplyingpressure to said reservoirs.

Zd'ln a cultivator adapted to cultivate row crops by the flame method,the combination or a wheeled vehicle, burner disposed to project arelativelylong flame substantially crosswise oi the plant row to passthrough the row, whereby weeds in the plant row in the travel of said ve'hicle, means on said wheeled vehicle for supplying fuel to said burner,and a ground engaglug support for said burner coupled to said wheeledvehicle whereby said burner is propelled by said vehicle but can riseand tall relatively thereto in the travel of its ground engaglug supportover the ground..

25. In a cultivator adapted to cultivate row crops by the flame method,the combination oi a wheeled vehicle adapted to travel along the plantrows, a plurality of burners propelled. by said vehicle projectingrelatively wide fan'- shaped flames substantially crosswise of the plantrows, means on said vehicle for supplying fuel to said burners, separateground engaging supports for said burners, and means pivotally couplingsaid separate ground engaging supports with said wheeled vehicle wherebyeach burner and its separate round engaging support can rise and fallother burner in the travel of'the ground engaging supports over unevenground.

26. In a cultivator adapted to cultivate row crops by the flame method,the combination of a wheeled vehicle adapted to span one or more plantrows, a plurality of burners propelled by said vehicle projectingrelatively wide fan-shaped flames substantially crosswise of said plant'rows from opposite sides of the row for passing through the row, meanson said vehicle for supplying fuel to said burners, an individual groundengaging support for each of said burners, means for adjustably mountingeach burner on its individual ground engaging support so as to enablethe burner to be adjusted relatively to its support, coupling means forseparately coupling each ground engaging support with said wheeledvehicle whereby each burner and its individual ground engaging supportcan rise and fall relatively to said wheeledvehicle and to the otherburners in the travel or-the ground engaging supports over unevenground, and lifting means actuatable by the operator from his drivingposition on said wheeled vehicle while the latter is in motionfor.lifting all of said burners to nonoperating positions. v

27. In a cultivatofiadaptedto cultivate row 'crops by the flame method,the combination of a 'wheeled vehicle adapted to travel along the rows,a plurality of burners propelled by said vehicle projecting flamesaround the bases of the plants in the plant rows, free floating groundengaging supports for said burners, and adjustable means connecting saidground engaging supports with said vehicle enabling said ground engagingsupports and burners to be shifted transversely relatively to each otherto difierent positions crosswise of said vehicle 28. In a cultivatoradapted to cultivate row crops by the flame method, the combination of awheeled vehicle adapted to travel along adjacent rows, a plurality ofburners propelled by said vehicle positioned between said adjacent rowsand on the outer sides of said adjacent rows and projecting flamessubstantially crosswise of said rows, and burnerspropelled by saidvehicle and positioned to project flames along the middle areas betweensaid rows.

29. In a cultivator adapted to cultivate row crops by the flame method,the combination of a wheeled vehicle adapted to travel along adjacentrows, a plurality of burners propelled by said vehicle and adapted toproject flames from the inner and outer sides of said plant rows aroundthe bases of the plants in said rows, and adjustable mounting clampsconnecting said burners with said vehicle whereby said burners can beinclined to different vertical angles and can be swiveled to differenthorizontal angles.

30. In a cultivator adapted to cultivate row crops by the flame method,the combination of a wheeled vehicle adapted to travel along adjacentrows, a plurality of burners propelled by said vehicle and positioned onthe outer and inner sides of said adjacent rows for projecting flamesaround the bases of the plants in saidrows, and means mounting saidburners on said vehicle enabling said burners to be adjustedtransversely of the vehicle to accommodate difierent row spacing ofdifierent crops.

31. In a cultivator adapted to cultivate row crops by the flame method,the combination of a wheeled vehicle adapted to travel along adjacentrows, a rock shaft extending transversely of said wheeled vehicle, meansoperative to rock said rock shaft, and burners carried by said rockshaft and disposed along the sides of said adjacent rows to projectflames on the bases of the plants in said rows, the rocking of saidrock, shaft being operative to swing said burners upwardly tononoperating position. i

32. In a cultivator adapted to cultivate row crops by the flame method,the combination of a tracor adapted to travel along adjacent plant rows,a plurality of burners on said tractor disposedalong the sides of said'adjaent rows and projecting flames on the bases of the plants in saidrows, 2. fuel reservoir on said tractor supplying fuel to said burners,a compressed air reservoir on said tractor supplying compressed air tosaid burners, and a compressor driven by said tractor for supplyingpressure to said reservoirs.

PRICE CHRENLEIGH McLEMORE.

